Drying-cylinder.



A. H. WHHE. DRYING CYLINDER.

APPLICATION FILED OCT. 22 I914.

Patented July 4, 1916.

W/TNESSES 7M@ A UNITED? STATES PATENT onirica.

AMBROSE ir. WHITE, `or BROOKLYN, ivi-:wimax DBYING- CYLINDER.

To all 'whom it may concern: Be itY known that I, AMBRosE 'I-I. WHITE, a'citizen of the United States, residing in f. the borough of Brooklyn, State of 'ew York, have invented certain new and useful Improvements in DryingyCylinders; and I do hereby declare the following to be a full, clear, and exact description of the ,inventiom such as will enable Y 10 others skilled in the -art to which it 'tains to make anduse the same.v

This'invention relates to the7 means employed for heating the peripheral surface of a drying cylinder. It is of special utility in drying cylinders of the type employed in paper-making machinery* but it may also be employedV in machines for other uses such,

for instance, as the .manufacturelof ltextile material.

In drying cylinders for paper-making machinesy as heretofore constructed, it has been common to provide means fonsupplying live steam to the interior of the cylinder so as to heat thecyli'nderjwall, from which the .25 heat is rather rapidly drawn'oif bycontact with the material to be dried. This contact i; commonly extends over a large part, but not all, of the outer surface of the cylinder...

The admitted steam condenses 'within the V ':ylinder r and the water of condensatlcn, lusually contaminated with some. amount of lubricating oil, has a Asubstantial insulating effect upon the portion of the cylinder wall with which itis in contact. The degree' of i, tion willnot -bel entirely `uniform -andjcori. responding variations of the temperature v "fof the cylinder wall will occur( It is c orn- "145jmon practice 11o-provide means for-continu-M ously'withdrawing theiwater of condensa's;

tien from' within the Cylinder; .but ai. =best this onlymitigatesthe 'evi- 1', and in. practical. operation 4it is'found thateven whenv these! devices are used the f quantity :of water `within the-'"cylinder..wi1l show-jsubstantial -rlvafriations "from 'time to time. Much dliiii1' culty' yhas consequently'. been experienced inK j Specification of Letters Patent.

county of Kings,

apperv'this insulating-eect dependsfupon the exv tent'to `which lthe liquid.- is distributed overi the inner wall of thecylinder bythe centrifugal. force due torotationof ,the cylinder, and'thisf in turn; depends upon the l speed' of rotationand-the amountof water @in the cylinder.; -In -anyl case the distribu-fthe .relatively high and substantially uni-v Y ,Patented July 4, 191e." .A Application med october 22, 1914. seria; No. 867,938.

have found that the diiiiculty maybe loverwater offcondensation so as to maintain the temperature of the whole of this water' as l' near the boiling point as possible andmake use of it as the immediate agency for distributing the heat of the steam uniformly to the entire wall of the cylinder. I find that this result may be accomplished by in-a trOducmgthe steam into the water of con-- t densation through any 4suitable conduit which" extends lengthwise vof the cylinder and discharges the steam beneath., orv in a )et or jets against, the water.

In vthe following disclosure I have made specific reference to preferred embodiments of the invention in which the steam isdirected into or against the water from a conduit extending lengthwise of the' cylinder and having a plurality of jetcrifices directed toward the cylinder wall, but it yis to be understood that this preferred form is not essentialto the invention, which in its 'broadl aspect includes any suitable means for introducing the steam with uniformlengthv-wise distribution and directly into the water lof condensation within the cylinder.

In the accompanying drawings, Figure 1 f is a centrallongitudinal Section of a drying cylinder provided 'with heating devices constructed in accordance with the invention, and Fig. 2 is a transverse section of a modified form of .the invention., l

Referring first torFig. l, adrying cylinploy'edin paper-making machines. This consists of ahollow cylindrical shell 10 and end members 1,1 and 12 vsecured'to opposite ends thereof. Each of these end members g'jll and-12 has a trunnion 13 adapted to be received Ain suitablebearings., .One ofthe trunnions lhas an axial opening therel"through for the reception of a steam, confc'onnected to apipe 15which extends radiallysoutward to a point adjacent-to the periphery of the cylinder where it is connected to f a 'steam discharge pipe 16, extending lengthwise of the cylinder close to its interior surface. On the side of the pipe 16- adjacent to the wall of the cylinder, outlets are provided for discharging the steam begneath 'or against the water of condensation der' is' Shown of the type commonly emduit-214.l The `inner end of this conduit isy extent as largely to im,-

the form of a Siphon for this purpose.

l length of the '-15maybej outlet pipe 17 extends concentrically through the conduit 14 andthe fitting 18 .connecting the conduit 14 with the pipe 15.

Within the cylinder the. outlet pipe 17 has a branch pipe 19. secured thereon and extending radially outward to a'point adjacent to the peripheral wall of the cylinder. The ,op-v

posite end of the outlet pipe 17 passes through the wall-of a fitting 20 and is connected with a discharge pipe 21. The fitting 20 is provided for the purpose of connecting the conduit 14 witha steam supply pipe 22. lThe order to reinforce the parts lying within the hollow cylinder, I vprefer to extendthe outlet pipe 1f? throughout the cylinder and to'locate its end in a concentric opening in the trunnion upon the end member of the cylinder opposite that through which the conduit 14 passes. Also the end of thel steam discharge pipe 16 opposite that which is connected to the pipe loined to the pipe 17. Such a connection isfshown at 23, a piece of piping being employed for this purpose though this piping is not in communication with the outlet pipe 17. v v In the operation of a machine employing this form of drying cylinder, steam would bel admitted through the pipe 22, conduit 14 and pipe 15, to the steam discharge pipe 16, and from this pipe the steam would pass .out through the numerous openings provided therein toward the adjacent wall of the cylinder, and into the water of coni densation. In any case, the heat of the steam forcibly introduced into the water of condensation will be rapidly disseminated throughout the water, by conduction and connection and by the circulation of the water incident to the rotation of the cylinder,"an'd the temperature of the water uniformly maintained close tothe boiling point.

tially uniform temperature of the cylinder wall lwhich is found to be so necessary to 'proper operation of a 'paper-making machine, maybe readily maintained and the detrimental edects resulting from uneven lheating of the surface ofthe drying cylinder are'avoided. -1 f The arrangement provides a substantially uniformA distribution of the injected steam lengthwise ofthe the relatively high and substanparticularly describedand has the additional advantage line of steam jets extended lengthf Although I have shown in Fig. 1 a single steam-discharge pipe within the cylinder cated at any other portion ofthe cylinder and that a number of pipes may be employed if desired, as indicated in Fig. 2 in which threepipes 16 are arranged at equal distances apart around the cylinder, the arrangement being otherwise the same as that of Fig. 1.

In order that the heating effect of the and located at the lower portion thereof, it @will be understood that the pipe maybe losteam shall be applied with uniformity to the drying cylinder, it is desirable that ythe steam pipe or pipes and the drying cylinder shall be relatively rotatable with respect to each other. Thus, in the constructions illustrated, the steam .pipe or pipes are'stationary, so that the cylinderis relatively rotatable with respect thereto So far as I amaware; it is broadly new to introduce the steam, in such a drying cylinder, into the'water of condensation to maintain that water atl a uniformly high temperature and make use of it 'as the agency for distributing the heatof the steam to the cylinder wall, and' the appended claims should have a correspondingly broad which water vof condensation collects, said' cylinder having means for introducing heating. steaml with uniform lengthwise distribution `directly into the water of condensation, whereby the water is maintained at a uniform high temperature and serves as the agency for distributing the heat of the steam to the cylinder wal j 2. A steam-heated drying cylinder in which water of condensation collects, said iio cylinder having means Ifor introducing heating steam with uniform lengthwise distribution directly into the water of condensation, whereby the water is maintained at a uniform high .temperature 'and serves as the agency for distributing'the heat of the steam to the cylinder wall, and means for withdrawing from the cylinder the excess water of condensation. Y

A steam-heatedvdrying cylinder having a steam conduit located within the cylinder and extending longitudinally thereof adjacent to the peripheral wall thereof and provided with outlets for directing steam issuing therefrom toward the peripheral wall of the cylinder `and means for conveying steam from the exterior of'the cylinder to A said conduit.

4.-' A steam-heated drying cylinder having v peripheral wall thereof, said pipe having outlet openings on the side thereof toward theadjacent Wall of the cylinder. A steam-heated drying cylinder having 'a conduit for carrying. steam to the interior o thereof, a pipe connected: tosaid conduit and located within the hollow` cylinder extending lengthwise thereof close to theinterior surface'of the peripheralwall of the cylinder and' provided 4v'vithaoiitl'ets for delivering steam toward"'saidg'surface with `substantially uniform lengthwiseA distribu-y tion, and means for withdrawing Water vof the interior of the cyl-` condensation from inder.-A

6.-.A steam heated drying cylinder 1n `which water of condensation collects and from which saidwater must be withdrawn, said cylinder having means for introducing heating steamidirectly into the water of condensation whereby the Water isl mantained at a uniform high temperature and serves as. the agency for distributing the heat of the steam to the cylinder Wall, said cylinder and steam introduction means bemg relatively other.

rotatable with respect to each` 7. A steam heated drying cylinder having trunnionsv atits ends, supports passing through the trunnions, and a steamconveying anddistributing pipe Within the cylinder mounted on said supports and extending lengthwise of the cylinder close to the pe-` ripheral wall thereof, said cylinder and pipe being relatively movable with respect to each other and said pipe having outlets in the side thereof adjacent to the wall of the cylinder and through which heating steam is discharged toward said wall; substantially as describe 8, A revoluble drying drum, hollow trunvnikon therefor, said drum having a plurality of perforated conduitsY extending parallel vwith the 4axis thereof and located therein `adjacent to the inner periphery thereof; and

means for supplying said conduits with heated `vapor admitted through a trunnion of said drum.

In testimony whereof I alix my signature, y

in presence of two witnesses.- V

' AMBROSE H..WHITE.

Witnesses: v

" EDWARD Hu'rcHINs, 4 CHESTER S. CoLso 

